<?php
/**
 * Easthv Zend Framework Project
 *
 *
 * LICENSE:
 *
 * @category   Zend
 * @package    Zend_Easthv
 * @copyright  Copyright (c) 2009-2010 Easthv Team @ East Hui Van Business Consulting Co., Ltd.(http://www.easthv.com)
 * @license    http://framework.zend.com/license/   BSD License
 * @version    1.0
 * @link       http://www.easthv.com
 * @since      1.0
*/

/**
 * String related functions collection
 *
 * @category   Zend
 * @package    Zend_Easthv
 * @copyright  Copyright (c) 2009-2010 Easthv Team @ East Hui Van Business Consulting Co., Ltd.(http://www.easthv.com)
 * @license    http://framework.zend.com/license/   BSD License
 * @version    1.0
 * @link       http://www.easthv.com
 * @since      1.0
 * @deprecated
 */
class Zend_Easthv_String
{

	/**
	 * Translates a number to a short alhanumeric version
	 *
	 * Translated any number up to 9007199254740992
	 * to a shorter version in letters e.g.:
	 * 9007199254740989 --> PpQXn7COf
	 *
	 * specifiying the second argument true, it will
	 * translate back e.g.:
	 * PpQXn7COf --> 9007199254740989
	 *
	 * this function is based on any2dec && dec2any by
	 * fragmer[at]mail[dot]ru
	 * see: http://nl3.php.net/manual/en/function.base-convert.php#52450
	 *
	 * If you want the alphaID to be at least 3 letter long, use the
	 * $pad_up = 3 argument
	 *
	 * In most cases this is better than totally random ID generators
	 * because this can easily avoid duplicate ID's.
	 * For example if you correlate the alpha ID to an auto incrementing ID
	 * in your database, you're done.
	 *
	 * The reverse is done because it makes it slightly more cryptic,
	 * but it also makes it easier to spread lots of IDs in different
	 * directories on your filesystem. Example:
	 * $part1 = substr($alpha_id,0,1);
	 * $part2 = substr($alpha_id,1,1);
	 * $part3 = substr($alpha_id,2,strlen($alpha_id));
	 * $destindir = "/".$part1."/".$part2."/".$part3;
	 * // by reversing, directories are more evenly spread out. The
	 * // first 26 directories already occupy 26 main levels
	 *
	 * more info on limitation:
	 * - http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/165372
	 *
	 * if you really need this for bigger numbers you probably have to look
	 * at things like: http://theserverpages.com/php/manual/en/ref.bc.php
	 * or: http://theserverpages.com/php/manual/en/ref.gmp.php
	 * but I haven't really dugg into this. If you have more info on those
	 * matters feel free to leave a comment.
	 *
	 * The following code block can be utilized by PEAR's Testing_DocTest
	 * <code>
	 * // Input //
	 * $number_in = 2188847690240;
	 * $alpha_in  = "SpQXn7Cb";
	 *
	 * // Execute //
	 * $alpha_out  = alphaID($number_in, false, 8);
	 * $number_out = alphaID($alpha_in, true, 8);
	 *
	 * if ($number_in != $number_out) {
	 *	 echo "Conversion failure, ".$alpha_in." returns ".$number_out." instead of the ";
	 *	 echo "desired: ".$number_in."\n";
	 * }
	 * if ($alpha_in != $alpha_out) {
	 *	 echo "Conversion failure, ".$number_in." returns ".$alpha_out." instead of the ";
	 *	 echo "desired: ".$alpha_in."\n";
	 * }
	 *
	 * // Show //
	 * echo $number_out." => ".$alpha_out."\n";
	 * echo $alpha_in." => ".$number_out."\n";
	 * echo alphaID(238328, false)." => ".alphaID(alphaID(238328, false), true)."\n";
	 *
	 * // expects:
	 * // 2188847690240 => SpQXn7Cb
	 * // SpQXn7Cb => 2188847690240
	 * // aaab => 238328
	 *
	 * </code>
	 *
	 * @author	Kevin van Zonneveld <kevin@vanzonneveld.net>
	 * @author	Simon Franz
	 * @author	Deadfish
	 * @copyright 2008 Kevin van Zonneveld (http://kevin.vanzonneveld.net)
	 * @license   http://www.opensource.org/licenses/bsd-license.php New BSD Licence
	 * @version   SVN: Release: $Id: alphaID.inc.php 344 2009-06-10 17:43:59Z kevin $
	 * @link	  http://kevin.vanzonneveld.net/
	 *
	 * @param mixed   $in	  String or long input to translate
	 * @param boolean $to_num  Reverses translation when true
	 * @param mixed   $pad_up  Number or boolean padds the result up to a specified length
	 * @param string  $passKey Supplying a password makes it harder to calculate the original ID
	 *
	 * @return mixed string or long
	 */
	function shortHash($in = '', $to_num = false, $pad_up = false, $passKey = null)
	{
		$index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		if ($passKey !== null) {
			// Although this function's purpose is to just make the
			// ID short - and not so much secure,
			// with this patch by Simon Franz (http://blog.snaky.org/)
			// you can optionally supply a password to make it harder
			// to calculate the corresponding numeric ID

			for ($n = 0; $n<strlen($index); $n++) {
				$i[] = substr( $index,$n ,1);
			}

			$passhash = hash('sha256',$passKey);
			$passhash = (strlen($passhash) < strlen($index))
				? hash('sha512',$passKey)
				: $passhash;

			for ($n=0; $n < strlen($index); $n++) {
				$p[] =  substr($passhash, $n ,1);
			}

			array_multisort($p,  SORT_DESC, $i);
			$index = implode($i);
		}

		$base  = strlen($index);

		if(!$in) {
			list($usec, $sec) = explode(" ", microtime());
			$in = $sec . substr($usec, 2);
		}

		if ($to_num) {
			// Digital number  <<--  alphabet letter code
			$in  = strrev($in);
			$out = 0;
			$len = strlen($in) - 1;
			for ($t = 0; $t <= $len; $t++) {
				$bcpow = bcpow($base, $len - $t);
				$out   = $out + strpos($index, substr($in, $t, 1)) * $bcpow;
			}

			if (is_numeric($pad_up)) {
				$pad_up--;
				if ($pad_up > 0) {
					$out -= pow($base, $pad_up);
				}
			}
			$out = sprintf('%F', $out);
			$out = substr($out, 0, strpos($out, '.'));
		} else {
			// Digital number  -->>  alphabet letter code
			if (is_numeric($pad_up)) {
				$pad_up--;
				if ($pad_up > 0) {
					$in += pow($base, $pad_up);
				}
			}

			$out = "";
			for ($t = floor(log($in, $base)); $t >= 0; $t--) {
				$bcp = bcpow($base, $t);
				$a   = floor($in / $bcp) % $base;
				$out = $out . substr($index, $a, 1);
				$in  = $in - ($a * $bcp);
			}
			$out = strrev($out); // reverse
		}

		return $out;
	}


	function explodeX($delimiters, $string)
	{
		$return_array = Array($string); // The array to return
		$d_count = 0;
		while (isset($delimiters[$d_count])) // Loop to loop through all delimiters
		{
			$new_return_array = Array(); 
			foreach($return_array as $el_to_split) // Explode all returned elements by the next delimiter
			{
				$put_in_new_return_array = explode($delimiters[$d_count],$el_to_split);
				foreach($put_in_new_return_array as $substr) // Put all the exploded elements in array to return
				{
					$new_return_array[] = $substr;
				}
			}
			$return_array = $new_return_array; // Replace the previous return array by the next version
			$d_count++;
		}
		return $return_array; // Return the exploded elements
	}

	/**
	 * Cutting string without word break
	 *
	 * @access public
	 * @param string $str string
	 * @param int $length allowed length int
	 *
	 * @return string
	 */
	public static function subStringWithWrap($str = '', $length = 1)
	{
		$len = strlen($str);

		if($len <= $length) {
			return $str;
		}

		for($i = $length; $i > -1; $i--){
			if($str{$i} == ' ')    {
				return substr($str, 0, $i) . ' ...';
			}
		}

		return substr($str, 0, $length) . ' ...';
	}

	/**
	 * SEO fiendly urlencode
	 * Only allow 0-9, a-z, A-Z
	 * replace all spaces to '-'
	 * strip all other characters
	 *
	 * @access public
	 * @param string $str string
	 *
	 * @return string
	 */
	public static function seoUrlencode($str = '')
	{
		if(!$str) {
			return '';
		}

		return strtolower(preg_replace('/-{2,100}/i','-',preg_replace('/[^\d\w]/i','-',trim($str))));  
	}

	/**
	 * SEO fiendly urlencode Zh-cn
	 * Only allow 0-9, a-z, A-Z, 
	 * replace all spaces to '-'
	 * strip all other characters
	 *
	 * @access public
	 * @param string $str string
	 *
	 * @return string
	 */
	public static function seoUrlencodeCn($str = '')
	{
		if(!$str) {
			return '';
		}

		return rawurlencode(
			strtolower(
				preg_replace('/-{2,100}/i', '-',
					preg_replace('/[^\d\w\x{4e00}-\x{9fa5}]/iu', '-', trim($str)) //remove all special to -
				)
			)
		);  
	}

	public static function safeUrl($name)
	{
		return strtolower(preg_replace('/[\/\?\+\%\#\&=]/','_',$name));
	}	
	
	public static function filterFullwidthCharacters($name)
	{
		return preg_replace('/[ ]/',"\s",$name);
	}
	
	public static function subCNStringWithWrap($str, $length, $encoding = "UTF-8")
	{
		mb_internal_encoding($encoding);
		
		$len = mb_strlen($str);
		
		if($len > $length){
			$str = mb_substr($str,0,$length);
		}
		
		return $str . (($len > $length) ? '...' : '');
	}

	public static function simpleTextToHtml($text)
	{

		$text = preg_replace("/(https*:\/\/[^\s]+)/i", "<a href=\"\${1}\" rel=\"nofollow\">\${1}</a>", $text);		
		
		$lines = explode("\n", $text);

		foreach($lines as $key => $line){
			$line = trim($line);
			//remove blank line
			if(!$line || $line == '&nbsp;'){
				unset($lines[$key]);
			}
		}

		return '<p>' . implode("</p><p>", $lines) . '</p>';
	}
}
